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BA51W12 Arkusz danych(PDF) 7 Page - Rohm

Numer części BA51W12
Szczegółowy opis  Dual output voltage regulator with power saving
Download  9 Pages
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Producent  ROHM [Rohm]
Strona internetowa  http://www.rohm.com
Logo ROHM - Rohm

BA51W12 Arkusz danych(HTML) 7 Page - Rohm

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BA51W12SAT
Regulator ICs
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Operation notes
(1) Although the circuit examples included in this hand-book are highly recommendable for general use, you should be
thoroughly familiar with circuit characteristics as they relate to your own use conditions. If you intend to change the
number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic
characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete
assurance regarding patent rights.
(2) Operating power supply voltage
When operating within the proper ranges of power supply voltage and ambient temperature, most circuit functions
are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed,
characteristic values do not change drastically within the proper rages.
(3) Power dissipation (Pd)
Refer to the power dissipation characteristics in Fig.12. If power dissipation exceeds the allowable limit, the
functionality of the IC will be degraded (such as reduction of current capacity by increased chip temperature). Make
sure to use the IC within the allowable range of power dissipation with a sufficient margin.
(4) Preventing oscillation at each output and bypass capacitor
To stop output oscillation, make sure to connect a capacitor between GND and each output pin (capacitance of at
least 10
µF over the whole operating temperature range is recommended). Oscillation can occur if capacitance
is susceptible to temperature. We recommended using a tantalum capacitor with minimal changes in capacitance.
Also, output can be further stabilized by connecting a bypass capacitor of about 0.33
µF between the input pin and
GND. Place the capacitor as near as possible to the input pin.
(5) Overcurrent protection circuit
An overcurrent protection circuit is installed in each output system, based on the respective output current. This
prevents IC destruction due to overcurrent, by limiting the current with a curve shape of “7” in the voltage-
current graph. The IC is designed with margins so that current flow will be restricted and latching will be prevented
even if a large current suddenly flows through a large capacitor. Note that these protection circuits are only good for
preventing damage from sudden accidents. Make sure your design does not cause the protection circuit to operate
continuously under transitional conditions (for instance, if output is clamped at 1VF or higher, short mode circuit
operates at 1VF or lower). Note that the circuit ability is negatively correlated with temperature.
(6) Thermal protection circuit
A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are turned off when the circuit
operates, and revert to the original state when the temperature drops to a certain level.
(7) We recommend installing a bypass line with a diode in your application if there is a mode where potential difference
between each output and input (VCC) or GND is reversed from the normal state. A reversed mode may cause
damage to the IC.
(8) Although the quality of this IC is rigorously controlled, the IC may be destroyed when the applied voltage or the
operating temperature exceeds their absolute maximum ratings. Because short mode or open mode cannot be
specified when the IC is destroyed, be sure to take physical safety measures, such as fusing, if any of the absolute
maximum ratings might be exceeded.


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